George, now to the Oscar Pistorius murder trial. Pistorius is back in court this morning after a month-long break. Closing arguments are under way for the former olympian charged with killing his girlfriend and ABC's lama Hasan has the latest. Lama, good morning. Reporter: Good morning, Amy. It's an explosive start to the closing arguments in the Oscar Pistorius murder trial with the prosecution arguing Pistorius was being deceitful, evasive and untruthful by referring to all of his indivisiconsistencies saying he arg argued about killing his girlfriend with intent. A five-month affair that's been filled with drama since the start. Today, that drama back on display. Lead prosecutor gerrie nel, aka the bull terrier going on attack. The accused was a deceitful version. His core version of events being absolutely devoid of any truth. Reporter: As he makes his final arguments to the judge and her two assessors punching holes in the defendant's case saying there was no perceived intruder that night. Pistorius killed his girlfriend model reeva steenkamp trying to prove he intended to shoot her after an argument. This is just coming from the accused. I fired shots at the toilet door and shouted to reeva. My lady, there is no way of interpreting this sentence any way but say, I deliberately fired shots. Reporter: Nel trying to show the blade runner was not a credible witness pouncing on his inconsistency while on the stand and focusing on 13 of what he called Pistorius' untruths. He heard a noise emanating from the toilet. Noise and movement. In Normal circumstances I wouldn't read it so squarefully but in this instance we have to because there's a difference between hearing movement and a noise. Reporter: Painting Pistorius as always placing the blame somewhere else. The accused refused to take any responsibility and would always place the blame for his actions somewhere else. Reporter: Untruthful and trigger happy. Well, tomorrow the defense is expecting to deliver its closing arguments before the judge can deliberate and deliver her final verdict. Remember, in South Africa there is no jury system, so it's up to the judge and her two assessors to make the final decision.

This transcript has been automatically generated and may not be 100% accurate.

See the Hospital Where Oscar Pistorius Underwent Psych Analysis

ABC News’ Lama Hasan is outside the facility where the Olympian spent the last 30 days.

Oscar Pistorius Not Mentally Ill at Time of Shooting, Experts Find

Experts believed Pistorius was "capable of appreciating the wrongfulness of his act" when he killed his girlfriend.

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